1st hello

src/chat/Client.java

@@ -1,7 +1,76 @@
 package chat;
 
+import java.io.DataInput;
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.net.InetAddress;
+import java.net.Socket;
+import java.util.Scanner;
+
 public class Client {
     public static void main(String[] args) throws Exception {
+
         System.out.println("Client started!");
+
+        String address = "127.0.0.1";
+        Scanner sc = new Scanner(System.in);
+
+        int port = 12345;
+        Socket socket = new Socket(InetAddress.getByName(address), port);
+        DataInputStream dis = new DataInputStream(socket.getInputStream());
+        DataOutputStream dos = new DataOutputStream(socket.getOutputStream());
+
+        System.out.println(dis.readUTF());
+
+        String str;
+        //Nick picking
+        while (true){
+            str = sc.nextLine();
+            dos.writeUTF(str);
+
+           str = dis.readUTF();
+            if (str.equals("run"))
+                break;
+            System.out.println(str);
+        }
+        str = dis.readUTF();
+        System.out.print(str);
+        readBuffer rd = new readBuffer(socket);
+        rd.start();
+        while (true) {
+            str = sc.nextLine();
+            if (str.equals("/exit")) {
+                rd.alive = false;
+                dos.writeUTF(str);
+                rd.join();
+                break;
+            }
+            dos.writeUTF(str);
+        }
+    }
+}
+
+class readBuffer extends Thread{
+    DataInputStream dis;
+    DataOutputStream dos;
+    boolean alive = true;
+
+    readBuffer(Socket socket) throws IOException {
+        this.dis = new DataInputStream(socket.getInputStream());
+        this.dos = new DataOutputStream(socket.getOutputStream());
+    }
+
+    @Override
+    public void run(){
+        String str = "";
+        while (alive){
+            try {
+                str = dis.readUTF();
+            } catch (IOException e) {
+                break;
+            }
+            System.out.println(str);
+        }
     }
 }

src/chat/Server.java

@@ -1,7 +1,179 @@
 package chat;
 
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.io.Serializable;
+import java.net.InetAddress;
+import java.net.ServerSocket;
+import java.net.Socket;
+import java.net.SocketException;
+import java.util.ArrayList;
+
 public class Server {
     public static void main(String[] args) throws Exception {
         System.out.println("Server started!");
+        int Clients = 1;
+        String address = "127.0.0.1";
+        int port = 12345;
+        ServerSocket ss = new ServerSocket(port, 50, InetAddress.getByName(address));
+        DataBase db = new DataBase();
+
+        while (true) {
+            Socket socket = ss.accept();
+            Cloent cl = new Cloent(socket, Clients, db);
+            cl.start();
+            db.addClient(cl);
+            Clients++;
+        }
+
+
+
+    }
+}
+
+class Cloent extends Thread{
+    DataInputStream dis;
+    DataOutputStream dos;
+    Socket socket;
+    DataBase db;
+    int count = -1;
+    int nbOfMsg = 10;//how many words get at enter chat
+
+
+    Cloent(Socket socket, int cleintsNb, DataBase db) throws IOException {
+        super("Client-" + cleintsNb);
+        this.db = db;
+        this.socket = socket;
+        this.dis = new DataInputStream(socket.getInputStream());
+        this.dos = new DataOutputStream(socket.getOutputStream());
+        dos.writeUTF("Hello, pick your Nickname pleasse!");
+    }
+
+    @Override
+    public void run(){
+        System.out.println("Client connected.");
+        String str = "";
+        String selfName = "";
+
+        //picking nickname
+        while (true){
+            try {
+                str = dis.readUTF();
+                System.out.println("Client wrote: " +str + " from " + Thread.currentThread().getName());
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+            if (db.getNameBase().contains(str)){
+                try {
+                    dos.writeUTF("Name already used, please pick other.");
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+            }
+            else {
+                try {
+                    db.addName(str);
+                    selfName = str;
+                    dos.writeUTF("run");
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+                break;
+            }
+        }
+
+        try {
+            dos.writeUTF(db.getChat(nbOfMsg));
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+
+
+        while (!str.equals("/exit")){
+            try {
+                str = dis.readUTF();
+            } catch (Exception e) {
+                try {
+                    socket.close();
+                    break;
+                } catch (IOException e1) {
+                    e1.printStackTrace();
+                }
+                e.printStackTrace();
+            }
+            if (!str.equals("/exit")) {
+                db.addMessage(selfName + ": " + str);
+                System.out.println("Client wrote: " + str + " from " + Thread.currentThread().getName());
+                try {
+                    //sending
+                    for (Cloent a : db.getClients()) {
+                        a.sendMsg(selfName + ": " + str);
+                    }
+                } catch (Exception e) {
+                    e.printStackTrace();
+                }
+            }
+            count += getWordsCount(str);
+        }
+        try {
+            Thread.sleep(1000);
+            db.getClients().remove(this);
+            socket.close();
+            System.out.println("Client disconnected.");
+        } catch (IOException | InterruptedException e) {
+            e.printStackTrace();
+        }
+    }
+
+    private int getWordsCount(String str){
+        return str.split("\\s+").length;
+    }
+
+    private void sendMsg(String msg) throws IOException {
+        dos.writeUTF(msg);
+    }
+}
+
+class DataBase implements Serializable {
+    private ArrayList<String> nameBase;
+    private ArrayList<String> messages;
+    private ArrayList<Cloent> clients;
+
+    DataBase(){
+        nameBase = new ArrayList<>();
+        messages = new ArrayList<>();
+        clients = new ArrayList<>();
+        messages.add("Hello from the server!");
+    }
+
+    synchronized void addName(String nameBase) {
+        this.nameBase.add(nameBase);
+    }
+
+    synchronized ArrayList getNameBase(){
+        return nameBase;
+    }
+
+    synchronized String getChat(int nb){
+        StringBuilder str = new StringBuilder();
+        if (nb > messages.size())
+            nb = messages.size();
+        for (int i = 0; i < nb; i++){
+            str.append(messages.get(messages.size() - (nb - i))).append("\n");
+        }
+        return str.toString();
+    }
+
+    synchronized void addMessage(String st){
+        messages.add(st);
+    }
+
+    synchronized ArrayList<Cloent> getClients() {
+        return clients;
+    }
+
+    synchronized void addClient(Cloent client){
+        this.clients.add(client);
     }
 }